This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Sums with Excluded Digits
Change the sign of even index entries of the reversed vector
Sum of diagonals elements of a matrix
Vectors counting by 2
Happy Free Wednesday!
Go back n times
Digit concentration in Champernowne's constant
String permutations on phone keyboard
Homemade: Control Charts
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